Tried the example on Windows 10 with Lepton 2.5 but the file "image_80x60_Y16.dat" contains only zeros, which is consistent with the reported minimum and maximum values being zero also. However, I'm sitting here in a room at a reasonable temperature and pointed the Lepton at myself -- I can assure you that the temperature here is well above zero Celsius!
Tried the example on Windows 10 with Lepton 2.5 but the file "image_80x60_Y16.dat" contains only zeros, which is consistent with the reported minimum and maximum values being zero also. However, I'm sitting here in a room at a reasonable temperature and pointed the Lepton at myself -- I can assure you that the temperature here is well above zero Celsius!